電動歯ブラシにおける毛先の形態，回転数と口腔清掃との関係について

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  • Comparative Relationship on Different Electric Toothbrushes with the shape of brushing and rotation rate in Oral Hygiene.

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Various reports have demonstrated the efficacy of electric tooth brushes on oral hygiene, and have also shown that the efficacy of manual tooth brushes on oral hygiene depends on the form and, the shape of the brushing surface, its hardness and the brushing method. We investigated the effect on oral hygiene of electric tooth brushes with forward or backward and eccentric vibrations whose brushing surface and vibration rate were different. This study included 8 subjects with clinically healthy gingivae (4 men and 4 women, aged 23-26 years with a mean of 23.8 years). Electric tooth brushes with forward and backward vibrations (vibration range, 2.0 or 2.5 mm) or eccentric vibrations (17 or 26..) were prepared. They had different fiber tip length intervals (1.5 or 2.0 mm) and rotation rates (2000, 2500, 3000/min). Each was used for 3 minutes per oral cavity, and the rate of plaque removal was then determined. The electric tooth brush with forward or backward vibrations, which yielded the highest rate of plaque removal, had a fiber tip length interval of 1.5 mm, vibration range of 2.0 mm and rotation rate of 2500/min. The electric tooth brush with eccentric vibrations, which provided the highest rate of plaque removal, had a fiber tip length interval of 1.5 mm, amplitude of 26.. and rotation rate of 3000/min. The results suggest that even with the electric tooth brush, the brushing method, the shape of the brushing surface, amplitude and rotation rate have a great influence on the rate of plaque removal.

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